1.

यदि x + y = 10 व xy = 21, तब x3 + y3 का मान ज्ञात कीजिए।

Answer»

x + y = 10 ……………. (1)

घन करने पर

(x + y)3 = (10)3

x3 + y3 + 3xy (x + y) = 1000

x3 + y3 + 3. 21 (10) = 1000

x3 + y3 + 630 = 1000

x3 + y 3 = 1000 – 630 = 370



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